Why I get error You can't add features to this edition of Windows while attempting to install Windows Media Center? And I can't find proper workarounds
Maybe You want to tell us a little more about your system and how and what kind of Windows Media Center you're trying to install. And you probably haven't forgotten that for Windows 8-8.1, Medicenter requires a separate activation.
Don't waste your time, Just use the patched version for win 10 (v 8.8.1 by t-s) it requires one click and it works on any flavour of w8.1 and server 2012R2 (not w8 or server 2012)
Do what you prefer, but keep in mind that w10 version has more features. For example is not blocked on remote Sessions and not affected by the annoying pop-up about the end of wmc online services. Also a kms activated w81 Pro/enterprise lasts for 180 days not 30 or 45 days like the official wmc.
But that's exactly how it should be done! Don't you really know that it's paid and completely separate feature/device and it needs a separate license? Do You have bought it ever? It's not free feature.
But however, Windows 8.1 Core lets me to upgrade it to Windows 8.1 Pro with Media Center. One question: Why Windows 8.1 Pro (even Retail) does not let me to add WMC?